MSP430FR2433: spi示例代码咨询

zhao ge 说：

可以解释一下这两个示例代码吗？

示例说明可以在您给出的链接内查看

//******************************************************************************
// MSP430FR243x Demo - eUSCI_A0, SPI 3-Wire Master Incremented Data
//
// Description: SPI master talks to SPI slave using 3-wire mode. Incrementing
// data is sent by the master starting at 0x01. Received data is expected to
// be same as the previous transmission TXData = RXData-1.

//******************************************************************************
// MSP430FR243x Demo - eUSCI_A0, SPI 3-Wire Slave Data Echo
//
// Description: SPI slave talks to SPI master using 3-wire mode. Data received
// from master is echoed back.

zhao ge 说：

但是在CCS内查看对应参数配置，好像没有数据传输

您是按照图示来连接两个板子的？观察的是 RXData 和 TXData？

Hi Susan Yang

我使用两个个MSP-EXP430FR2433模块分别烧录msp430fr243x_euscia0_spi_09.c和msp430fr243x_euscia0_spi_10.c示例代码。

我尝试在master这端添加断点参数打印，读取到的RXData和UCA0TXBUF不会有任何改变，RXData一直是255，UCA0TXBUF一直是0x00050E，。我保证从设备先于主设备工作。

谢谢反馈。我拿板子测试后给您回复

Hi Susan Yang
    我们尝试拔掉 J101的RXD 和 TXD 跳线帽，再次进行测试，使用同样的示例代码，但是打印的TxData和RxData与你测试情况不符，请帮助确认一下，谢谢。

附上我的测试代码

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//******************************************************************************
//   MSP430FR243x Demo - eUSCI_A0, SPI 3-Wire Master Incremented Data
//
//   Description: SPI master talks to SPI slave using 3-wire mode. Incrementing
//   data is sent by the master starting at 0x01. Received data is expected to
//   be same as the previous transmission TXData = RXData-1.
//   USCI RX ISR is used to handle communication with the CPU, normally in LPM0.
//   ACLK = ~32.768kHz, MCLK = SMCLK = DCO ~ 1MHz.  BRCLK = SMCLK/2.
//
//
//                   MSP430FR2433
//                 -----------------
//             /|\|                 |
//              | |                 |
//              --|RST              |
//                |                 |
//                |             P1.4|-> Data In (UCA0SIMO)
//                |                 |
//                |             P1.5|<- Data OUT (UCA0SOMI)
//                |                 |
//                |             P1.6|-> Serial Clock Out (UCA0CLK)
//
//
//   Ling Zhu
//   Texas Instruments Inc.
//   Sept 2015
//   Built with IAR Embedded Workbench v6.20 & Code Composer Studio v6.0.1
//******************************************************************************
#include <msp430.h>

unsigned char RXData = 0;
unsigned char TXData;

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;                 // Stop watchdog timer

    P1SEL0 |= BIT4 | BIT5 | BIT6;             // set 3-SPI pin as second function

    UCA0CTLW0 |= UCSWRST;                     // **Put state machine in reset**
    UCA0CTLW0 |= UCMST|UCSYNC|UCCKPL|UCMSB;   // 3-pin, 8-bit SPI master
                                              // Clock polarity high, MSB
    UCA0CTLW0 |= UCSSEL__SMCLK;               // SMCLK
    UCA0BR0 = 0x01;                           // /1, fBitClock = fBRCLK/UCBRx
    UCA0BR1 = 0;                              //
    UCA0MCTLW = 0;                            // No modulation
    UCA0CTLW0 &= ~UCSWRST;                    // **Initialize USCI state machine**
    UCA0IE |= UCRXIE;                         // Enable USCI_A0 RX interrupt
    TXData = 0x01;                            // Holds TX data

    PM5CTL0 &= ~LOCKLPM5;                     // Disable the GPIO power-on default high-impedance mode
                                              // to activate previously configured port settings
    while(1)
    {
        UCA0IE |= UCTXIE;                     // Enable TX interrupt
        __bis_SR_register(LPM0_bits | GIE);   // enable global interrupts, enter LPM0
        __no_operation();                     // For debug,Remain in LPM0
        __delay_cycles(2000);                 // Delay before next transmission
        TXData++;                             // Increment transmit data
    }
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
    switch(__even_in_range(UCA0IV,USCI_SPI_UCTXIFG))
    {
        case USCI_NONE: break;                // Vector 0 - no interrupt
        case USCI_SPI_UCRXIFG:
              RXData = UCA0RXBUF;
              UCA0IFG &= ~UCRXIFG;
              __bic_SR_register_on_exit(LPM0_bits);// Wake up to setup next TX
              break;
        case USCI_SPI_UCTXIFG:
              UCA0TXBUF = TXData;             // Transmit characters
              UCA0IE &= ~UCTXIE;
              break;
        default: break;
    }
}

Hi Susan Yang

    我尝试对比master端代码，没有任何差异，请问CCS内你是怎样调试的？也是通过断电打印参数吗？是否有某些特殊的配置？

zhao ge 说：

也是通过断电打印参数吗？

我没有设置断点，而是全速运行后暂停，而后查看RXData和 TXData的值

SPI有时序要求，不建议打断点